Question

what caused the ozone layer in the atmosphere decreases about 50% in the north pole​

Answer 1

Answer:

The phenomenon was caused by an extremely cold and persistent stratospheric winter, resulting in significant ozone destruction, which, unusually, continued into spring. ... Destruction of stratospheric ozone takes place in the polar regions when temperatures drop below -80°C.

Answer 2

Answer:

The phenomenon was caused by an extremely cold and and persistent stratospheric winter, resulting in significant ozone destruction which unusually continued into spring......The ozone layer acts like a shield that protects life on earth from harmful ultraviolet solar radiation